This is an Amazing little sub. I have 2 of them. One stopped working just before covid and took it to a repair shop. This guy lost it or sold it. He asked for proof, so I showed him a photo I took of the serial number of the sub......sitting on the floor of HIS shop. A week later i gave him the original Box with the same serial number. He then gave me $450 for it.
LOL! Epic, dude! There are some shifty people out there, and the most likely issue originally with it was the Sanyo STK4040V IC (I'm assuming), and good luck to him to find a genuine one. And, yes. I've been using the sub now for 4 days, and with a little fiddling of the crossover and gain pots, I think I've got the perfect amount of bass to compliment my Accusound speakers.